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I use 15W-40 Rotella conventional oil, is also rated for diesel use. Now have 375 hours on it. No issues at all. Also use in trailer mounted RV ready champion that likely has 5 times as many hours.
I even use it in drag car engine (406 small block Chevy) with zero wear issues.
Synthetics have thier place, I have not seen any wear issues on engines I have pulled apart. Just opened up a 350 Chevy that was in drag car for 7 years. Only piston ring wear. I could reuse all engine bearings except they are not expensive. This engine has routinely been turned over 7,000 RPM. Always with Castrol GTX 20W-50 or a Mix of 20W-50 and 15W-40.
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